As an Android developer, you’re used to send email thanks to Android standard API provided in standard SDK. To achieve that, you use Intent.ACTION_SEND and call startActivity method to delegate to OS the sending email process.
Perhaps, you would like to manage the entire process in your application when you send an email in Android. If you want to make this, the solution is to use the port of JavaMail API for Android that is available here : http://code.google.com/p/javamail-android/
This port consists in 3 jars that you must download :
Once you got these jars, you can put them in the libs directory of your application project. Now, we can start the tutorial.
1. Define a JSSE Provider
First step is to define a JSSE (Java Security Socket Extension) Provider. To make that, we can get JSSE Provider of the Harmony project :
2. Implement a DataSource for data to send
To transport data during sending email, you must implement javax.activation.DataSource . Here, we choose to create a byte array implementation :
3. Create Mail Sender
Third step is to create email sender object that will contain all the logic to send email. Here, we’re going to use GMail as SMTP server. So, class will be named GMailSender :
In a static block, we add our JSSE Provider to Security class.
Like our email sender is specialized for GMail, mailhost is hard coded. So, constructor takes only user and password to authenticate to SMTP server. In constructor, we define all the Properties used during the Session which we get a default instance.
You need also to override getPasswordAuthentication method and you must return a PasswordAuthentication instance that use user / password entered in constructor.
Last step is the sendMail method that takes as arguments subject, body, sender and recipients. Here, we use MimeMessage associated to current Session. Email body is transported inside our ByteArrayDataSource previously created.
To send email, we finish by call static method Transport.send with message in parameter.
4. Send an email
To send an email, don’t forget to add Internet permission to your AndroidManifest :
<uses-permission android:name=”android.permission.INTERNET” />
It’s also important to send email in a separate Thread to avoid NetworkOnMainException. So, code is here :
5. Test the application
To test the application, you must authorize external access to your GMail account by going to this page : https://www.google.com/settings/security/lesssecureapps
Then, you must enable less secure apps :
Now, you can launch your Android application and check that GMailSender works pretty well :
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